Safety-valve.



J. J. COOK., SAFETY VALVE.

APPLICATION FILED 111111113, 41913.

- Patented June 23, 1914.

1 1 ,@.\\xf/. lv N .o .wm m l ITEB STATES PATENT OFFICE.

JOHN J. COOK, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO CROSBY STEAM GAGE &VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION.

SAFETY-VALVE.

Specification of Letters Patent.

Application led .Tune 13, 1913.

Patented June 23, 1914.

sensi No. 773,460.

To all ywlmi/'zit may conce/wv.

Be it known that I, JOHN J. Coon, a

citizen of the UnitedStates, and a resident of Medford, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in datemi-Valves, of which the following is aspecification.

i This invention relates to steam safety valves and more particularlyTto the form and disposition of the disk employed therein, which is animprovement on that shown and described in Letters `ljatent Nos. 793,947and 791l,()34f dated July 4, 1905. The disk ot' the patents referred tocomprises the middle frustum of a sphere in circumferential engagementwith its inclosing Cylinder, or cage, and is held to its seat, or seats,by a pintle engaging its center at practically a point, by which pivotalarrangement the disk is enabled to rot-ate with a minimum of friction,but with the result that, when steam is slowly generating beneath thedisk, the latter is 'liable to flutter and sing, or chatter, therebycausingdisagreeable noises. To overcome this difficulty, whilepreserving the spherical form of disk, is the object of the presentinvention, which is illustrated by the accon'ipanying drawings in which:

Figure 1 is a vertical central section partly in elevation of the safetyvalve. Fig. Q is a section on the line 2-2 Fig. 1.

1 is a valve furnished with the base 2, in which is disposed the popchamber 3 with its outlets 4t controlled by the ring 5 constituting thelower end of the outer casing 5, which is in threaded engagement withthe valve casing 6 threaded to said base 2. In this base Q are disposedalso the annular valve seats 7 and S, whereon is seated the valveproper, or disk, 9 which constitutes the middle frustum of a sphere,definable in this instance as including the adjacent parts of twohemisplieres. This disk 9 is arranged in the valve casing 6, engagingsaid casing circumferentially, and is adapted to rise and fall and tofreely rotate in any direc# tion, while maintaining said engagement.This disk is furnished 0n its upper face with the centrally disposedboss 9, the top of which forms the zone of a sphere 9b, concentric withthe center of the disk as indicated at 10. The spring` washer 11,furnished with the stem 11a which extends upwardly into and slidinglyengages the adjustable spring compression bolt 12 screwed into the valvecasing 6, comprises a spider, whose arms 13 slidingly engage the valvecasing 6 and whose under side is concaved to engage the spherical boss9a, forming therewith a ball and socket joint. The spring 14 is mountedin the valve casing being conned betw en the compression bolt 12 and thespring washer 11.

It is obvious from the construction shown that, whatever position,within the range of its movements, the disk may assume, the sliding`contact between the spring washer and the disk, while varying in extent,will never become pivotal and it has been found by experiment that thissliding Contact. affords enough friction to prevent the uttering of thedisk which, as has been said, may occur when the pivotal arrangement ofdisk and pintle is employed as in the earlier patents.

I claim:

1. In a safety valve, the combination, with the valve base, valve casingmounted .thereon and valve seat disposed therein, of

a disk constituting the middle frustum of a sphere, circumferentiallyengaging said easing and furnished on its upper face with a bossterminating in the frustum of a sphere concentric with that of the disk;a concaved spring washer engaging the boss of the disk -and formingtherewith a ball and socket joint; and a spring surmounting the springwasher.

2. In a safety valve of the character described, in combination, a diskconstituting the middle frustum of a sphere and furnished on its upperface with a boss termi nating in the frustum of a sphere concentric withthat of the disk, and a concaved spring Washer forming with said boss aball and socket joint.

3. In a safety valve, the combination,

ywith the valve base, valve casing mounted thereon and valve seatdisposed therein, of a disk constituting the middle frustum of a sphere,oircumferentially engaging said casing and furnished on its upper facewith a boss terminating in the frustum of a .sphere concentric with thatof thedisk; a

concaved spring washer slidingly engaging the valve casing and formingwith said boss a ball and socket joint; and a spring surmounting thespring washer.

4. In a safety valve of the character described, in combination, a diskconstituting the middle flustuni of' Sphere and fui"- nished on itsupper face with a boss termiv mating' in the frustum of a sphereconcentric with that of the disk; and a concnved spying Waeher siidinglyengaging the valve casing and forming with said boss a bail and Socketjoint.

5. In a safety valve of the character de- Scibed, in combination, a diskconstituting the middle it'rustum of a sphere and in]`- nished on itsupper face with a spherical boss concentric with Said disk; and a conmedspring washer forming with said boss a bail and socket joint.

6. In u safety miv@ oi' the character described, u disk constituting themiddle frustuin oit a sphere and furnished on its upper fue@ with aspherical boss concentric With Said disk.

In testimony whereof I have aiiixed my signature, in presence oi' twoWitnesses.

JOHN J. COOK. Witnesses RALPH W. FOSTER, GEORGE Gr. CLARK.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, 'Wnhingtom D. C.

